Pool Volume Calculator

Find how many gallons or liters of water are needed to fill a swimming pool by selecting the pool shape and size below.

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How to Calculate the Volume of a Rectangular Pool

Calculate the volume of a rectangular swimming pool by multiplying the length by width by depth.

The volume of a rectangular swimming pool in gallons can be found by multiplying length in feet × width in feet × average depth in feet × 7.48. The first part of this formula determines the volume of water in cubic feet. The second part converts cubic feet to gallons, there are 7.48 gallons of water per ft3 of water. Most pools have varying depths that slope from shallow to deeper. To accurately find the volume of water the average depth must be used. To find the average depth add the shallow depth with the deep depth then divide by 2, eg. (shallow + deep) ÷ 2.

How to Calculate the Volume of a Circular Pool

Calculate the volume of a circular swimming pool by multiplying the radius by the radius by PI and then multiplying by the depth.

The volume of a circular swimming pool can be found by multiplying the radius in feet × the radius in feet × 3.14 × average depth in feet × 7.48. The first part of this formula(radius × radius × 3.14) determines the area and multiplying by the depth finds the volume. Multiplying by 7.48 finds the gallons of water per ft3 of water.

How to Calculate the Volume of an Oval Pool

Calculate the volume of an oval swimming pool by multiplying the length by width by PI by depth and then divide by 4.

The volume of an oval swimming pool can be found by multiplying the length in feet × the width in feet × 3.14 ÷ 4 × average depth in feet × 7.48. The first part of this formula(length × width × 3.14 ÷ 4) determines the area and multiplying by the depth finds the volume. Again, multiplying by 7.48 determines how many gallons of water are in the pool. Like a rectangular pool, the average depth can be found by adding the shallow and deep depths and then dividing by 2.

How to Calculate the Volume of an Irregular Oblong or Kidney Shaped Pool

Calculate the volume of an oblong swimming pool by adding the short width and the long width then multiplying by .45 by length by depth then by 7.48

The volume of a kidney shaped pool is a little more complicated. It can be found by multiplying the length in feet × the shorter width in feet × the longer width in feet × .45 × average depth in feet × 7.48. The first part of this formula(length × short width × long width × .45) finds the area and then the volume is found by multiplying by the depth. Like before, multiplying by 7.48 finds the number of gallons in the pool.

Weights and Measures

To find the number of liters in a pool you can use our gallons to liters unit conversion calculator or multiply the gallons by 3.79. To find the weight in pounds of the water in the pool you can multiply the number of gallons by 8.33. A cubic foot of water is 12″ wide × 12″ long × 12″ deep and weighs 62.4 pounds.

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